Angry Birds hatches on Facebook

Facebook is a hot spot for casual games, but until today, it lacked arguably the hottest on the market. Today, Rovio's ultrapopular strategy game Angry Birds landed on the social networking giant.

Angry Birds on Facebook offers gamers new power-ups and additional social features. The new power-ups are Sling Scope, King Sling, Super Seeds, and Birdquake.

As for the game's new social features, those who play Angry Birds on Facebook can brag about their high scores with news feed posts, and they can give friends "mystery gifts," which contain power-ups.

Angry Birds is available on a number of platforms, including the 3DS, PSP, PlayStation 3, iOS and Android mobile devices, Google Chrome, Google Plus, and Amazon's Kindle Fire. The game has been downloaded over 500 million times, including 6.5 million instances on Christmas Day alone.